Cobalt Oxalate Formation on Thin-Film Magnetic Recording Media

Author

Karis, T.E. ; Guo, X.C. ; Marchon, B. ; Raman, V. ; Hsiao, Y.-L.

Author_Institution

Hitachi Global Storage Technol., San Jose, CA

Volume

42

Issue

10

fYear

2006

Firstpage

2507

Lastpage

2509

Abstract

Needle-like crystalline nanostructures were formed on the surface of a lubricated experimental thin-film media during exposure to elevated temperature and humidity. Clusters of nodules were formed on unlubricated media during the same exposure. Both the needles and nodules were identified as cobalt oxalate by Micro-Raman spectroscopy. A chemical mechanism is proposed to explain how cobalt hydroxide corrosion product and atmospheric oxalic acid combine to form cobalt oxalate in the presence of moisture

Keywords

Raman spectroscopy; cobalt alloys; corrosion; disc drives; lubricants; magnetic recording; nanostructured materials; atmospheric oxalic acid; chemical mechanism; cobalt hydroxide corrosion product; cobalt oxalate formation; crystalline nanostructures; disk drives; lubricated media; magnetic disk; microRaman spectroscopy; thin film magnetic recording media; Cobalt; Crystallization; Humidity; Magnetic films; Magnetic recording; Nanostructures; Needles; Spectroscopy; Temperature; Transistors; Cobalt alloys; corrosion; disk drives; disks; magnetic disk;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2006.878629

Filename

1704347